CN102916582A - Bridge-type dual-mode wide-input buck converter - Google Patents
Bridge-type dual-mode wide-input buck converter Download PDFInfo
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- CN102916582A CN102916582A CN2012104714406A CN201210471440A CN102916582A CN 102916582 A CN102916582 A CN 102916582A CN 2012104714406 A CN2012104714406 A CN 2012104714406A CN 201210471440 A CN201210471440 A CN 201210471440A CN 102916582 A CN102916582 A CN 102916582A
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Abstract
The invention discloses a novel bridge-type dual-mode wide-input buck converter and belongs to a direct current/direct current converter. The converter comprises a wide range input power supply, a filtering inductor, a filtering capacitor, two pump-rising capacitors, a load equivalent resistor, a group of metal-oxide-semiconductor field effect transistor (MOSFET) switch bridges and a group of diode bridges. The novel bridge-type dual-mode wide-input buck converter has two working modes, when an input voltage class is high, the converter works under a first mode, the voltage transmission ratio is D/2; and when an input voltage class is low, the converter works under a second mode, and the voltage transmission ratio is D. Compared with a BUCK converter under same situations in the two different modes, the input voltage range of the converter is wide, voltage stress of a switch tube is reduced by a half, and current stress is unchanged. Therefore, the novel bridge-type dual-mode wide-input buck converter is applicable to depressurization fields with wide input voltage class ranges.
Description
Technical field
The present invention relates to a kind of circuit topological structure and application thereof of DC/DC converter, be particularly suitable for the wider step-down occasion of input voltage rate range, and be a kind of converter that possesses double mode automatic switching function.
?
Background technology
Along with the development of power electronic technology, semiconductor device, and the extensive use of Switching Power Supply in every profession and trade, the demand of DC/DC converter has been become increasing, it at partial row already through becoming a sign weighing economic development.For traditional voltage-dropping type BUCK converter, it belongs to single-stage converter, and its voltage transmission ratio can not be very high, namely can not well be applicable to require the occasion of wide input; The inverse peak voltage that its fly-wheel diode can bear is the maximum voltage value decision by input, and it is higher to work as input voltage, the switch conduction time is shorter, diode bears more high shorter high voltage pulse during switch conduction, the voltage that its switching tube bears at blocking interval also has input voltage to determine.Therefore, in the high input voltage occasion, because it is constant to flow through the average current of diode, switching tube, cause that its temperature sharply rises, energy consumption increases, thereby whole transducer effciency is descended, even cause permanent damage.
Twin-stage cascade connection type BUCK converter is a kind of multilevel converter, and it can effectively improve the some shortcomings of single-stage BUCK converter, but owing to increased by one times circuit devcie, its that makes is bulky, and control is complicated, and system is unstable etc.Crisscross parallel BUCK converter also belongs to a kind of multilevel converter, it is owing to the company's of taking staggered branch road is worked respectively, be conducive to the heat radiation of system and reducing of filter inductance value, but the voltage stress of its diode, switching tube do not reduce, and the inapplicable occasion that requires wide input.Non-isolation three level BUCK converters also belong to multilevel converter, its dividing potential drop by two series capacitances, and the diode that effectively reduces, the voltage stress of switching tube, but the problem that exists remains and can not be applicable to require wide input occasion.What more than introduce all is the non-isolation type buck converter.For the isolated form buck converter, because the existence of isolation module is arranged, so that the volume and weight of converter increases greatly, control also relative complex, also to consider the EMC(Electro Magnetic Compatibility) etc. problem, so generally do not consider at this.
?
Summary of the invention
For the prior art above shortcomings, the object of the present invention is to provide the double mode wide input buck converter of a kind of bridge-type, it is better compatible to reduce switching device (switching tube and diode) voltage stress and the advantage that increases the voltage transmission ratio, makes it better be applicable to the wider occasion of input voltage rate range.
Realize above-mentioned purpose, the present invention adopts following technical scheme: the double mode wide input buck converter of a kind of bridge-type, it is characterized in that, and comprise: the switch bridge
, diode bridge
, two pumps rise electric capacity
,
, filter inductance
And filter capacitor
Wherein, described switch bridge
By 4 N channel enhancement switch mosfets
,
,
With
Form first switch
With the 3rd switch
Series arm and second switch
, the 4th switch
Series arm in parallel; First switch
Source electrode and the 3rd switch
Drain electrode link to each other, its series connection node is designated as b; Second switch
Source electrode and the 4th switch
Drain electrode links to each other, and its node is designated as d; Two series arm parallel connections, first switch
Drain electrode and second switch
Drain electrode link to each other the 3rd switch
Source electrode and the 4th switch
Source electrode link to each other, node is designated as respectively a, g; The grid of 4 MOSFET pipes connects signal successively
,
,
With
Diode bridge
By 4 diodes
,
,
With
Form first diode
With the 3rd diode
Series arm and second diode
With the 4th diode
Series arm in parallel; First diode
Negative electrode and the 3rd diode
Anode link to each other, its series connection node is designated as c; Second diode
Negative electrode and the 4th diode
Anode link to each other, its series connection node is designated as e; First diode
Anode and the 3rd diode
The anode connected node be designated as f; The 3rd diode
Negative electrode and the 4th diode
Negative electrode link to each other and and switch bridge
Share a node a; Node a and node f are exactly diode bridge
Two sys nodes;
Two pumps are given birth to electric capacity
,
Respectively the switch bridge
And diode bridge
In separately brachium pontis couple together: first pump rises electric capacity
Anode be connected in node b, negative terminal is connected in node c, second pump rises electric capacity
Anode be connected in node d, negative terminal is connected in node e;
Filter inductance
And filter capacitor
Form a low pass filter, wherein, filter capacitor
Two ends shunt load equivalent resistance
By
,
,
The two-port network that forms meets respectively node a and node f;
At first, converter in advance according to the input supply voltage fluctuation range (
) and voltage switching point of ripple minimum principle calculating setting
, namely
When input voltage at switching point
When changing up and down, the converter mode of operation that can automatically switch; Secondly, converter has two kinds of mode of operations, when
The time, namely be called the high input voltage situation, converter work this moment and pattern one, its voltage transmission ratio is
D/ 2; When
The time, namely be called the low pressure input condition, converter work this moment and pattern two, its voltage transmission ratio is
D DSpan be [0,1].
Compared to existing technology, the present invention has following beneficial effect:
The present invention has the autonomous function of switching of pattern.Converter in advance according to the input supply voltage fluctuation range (
) and voltage switching point of ripple minimum principle calculating setting
, when input voltage at switching point
Near when fluctuation, converter can with
For standard switching point automatic switchover mode of operation, make converter be operated in optimum state.
The present invention adopts distinctive dual-mode structure, can better adapt to the variation of input voltage.When input voltage large (
) time, converter is operated in pattern one, and this moment, converter had large voltage transmission function, and the voltage transmission ratio is
D/ 2, it is half of input voltage that pump rises capacitance voltage, has reduced half so the voltage stress of fly-wheel diode is compared with the BUCK converter in the situation; When input voltage less (
) time, converter is operated in pattern two, and this moment, converter was the same with the BUCK converter, and the voltage transmission ratio is
D, pump rises electric capacity and does not work, and it is half of input voltage that fly-wheel diode connects dividing potential drop and stress.
?
Description of drawings
Fig. 1 is double-bridge structure circuit diagram of the present invention.
Fig. 2 has the double mode wide input decompression converter circuit schematic diagram of the double mode bridge-type of double-bridge structure.
Fig. 3 is that converter works in for the moment each switch mode equivalent schematic of pattern.
Fig. 4 is converter each switch mode equivalent schematic when working in pattern two.
Fig. 5 ~ 6th, main waveform schematic diagram under two kinds of mode of operations of converter.
Symbol and being denoted as among Fig. 1:
~
Represent four switch mosfet devices, they consist of the switch bridge
~
Represent four diode components, they consist of diode bridge
,
The expression pump rises electric capacity; A ~ g is connected node;
Consistent among Fig. 2 among the symbol of double-bridge structure and Fig. 1, the symbol of increase has:
The expression input voltage;
The expression filter inductance,
The expression filter capacitor, they consist of low pass filter jointly;
Expression load equivalent resistance.
Be consistent among same Fig. 1 of each symbol, 2 in the accompanying drawing 3 ~ 4.
Symbol and being denoted as in the accompanying drawing 5 ~ 6:
The expression switching tube
,
,
,
Working signal;
The expression inductance
The electric current exemplary waveforms,
The mean value of expression inductance;
The expression pump rises electric capacity
,
The voltage exemplary waveforms;
The expression switching tube
,
,
,
The voltage stress exemplary waveforms;
The expression diode
,
,
,
The voltage stress exemplary waveforms.
?
Embodiment
Below in conjunction with accompanying drawing embodiments of the present invention and operation principle are further described:
Referring to Fig. 1, be double-bridge structure circuit diagram of the present invention, Fig. 2 has the double mode wide input decompression converter circuit figure of the double mode bridge-type of double-bridge structure.Its circuit topology is characterized as: the switch bridge
By N-channel MOS FET switch
,
Series arm and switch
,
Series arm is in parallel to be consisted of, wherein switch
,
The series connection mid point is designated as b, switch
,
The series connection mid point is designated as d, and two branch circuit parallel connection nodes are designated as respectively a, g; Diode bridge
By diode
,
Series arm and diode
,
Series arm is in parallel to be consisted of, wherein diode
,
The series connection mid point is designated as c, diode
,
The series connection mid point is designated as e, diode
,
With the switch bridge
Share a tie point, their negative terminals are connected in an a jointly, and diode
,
The common tie point of anode be designated as f.Tie point a and f are exactly diode bridge so
Two be connected in parallel a little; Two pumps are given birth to electric capacity respectively the switch bridge
And diode bridge
In separately brachium pontis couple together, specifically connect as follows: pump rises electric capacity
Anode be connected in a b, negative terminal is connected in a c, pump rises electric capacity
Anode be connected in a d, negative terminal is connected in an e; Filter inductance
And filter capacitor
Form a low pass filter, wherein, electric capacity two ends shunt load equivalent resistance
By
,
,
The two-port network that forms is tie point a and f respectively; Input power
Anode is contact g in succession, and negative terminal is contact f in succession.The distinctive working in double modes character of the present invention has made its better compatibility and has reduced switching device (switching tube and diode) voltage stress and the advantage that increases the voltage transmission ratio, makes it better be applicable to the wider occasion of input voltage rate range.
Each switch mode equivalent schematic when Fig. 3, the 4th, converter work in two kinds of patterns, did following hypothesis before analyzing: 1. all switching tubes of converter, diode, energy-storage travelling wave tube are ideal element, and the capacitance voltage ripple is zero; 2. all inductance elements all are in continuous conduction mode in the converter.
The below is 3,4 narration specific works principle of the present invention and the courses of work with reference to the accompanying drawings:
For example: input direct voltage
,And output voltage requires to be stabilized in
The value of converter voltage transmission ratio under two kinds of different modes is with different, that is: so
,
And
,
Condition under, in conjunction with ripple minimum principle (voltage transmission than more convergence and 0.5), obtain as calculated the voltage switching point
So in this example, when
The time, converter is operated in pattern for the moment better; When
The time, better when converter is operated in pattern two.
When be input as voltage higher (
) time, the present invention works in pattern one, and it has four kinds of mode, below in conjunction with accompanying drawing 3, the work of each switch mode is analyzed.
Corresponding [0, the t of switch mode a(
1] constantly, its equivalent circuit accompanying drawing 3 mode (a))
At this moment, switching tube
,
Closure,
,
Disconnect diode
,
Work,
,
Do not work.Input power
Rise electric capacity by pump
, diode
Branch road powers to the load, and pump rises electric capacity
Continue charging.Pump rises electric capacity
Pass through diode
To load continuous discharge, inductance
Electric current is linear to be increased.
Corresponding [the t of switch mode b(
1, T
S] constantly, its equivalent circuit accompanying drawing 3 mode (b), (d))
Switching tube
,
,
,
All closed, diode
,
,
,
All work.Pump rises electric capacity
,
Keep voltage constant, inductance
Pass through diode bridge
To load discharge, its electric current linearity reduces.
Corresponding [the T of switch mode c(
S, t
2] constantly, its equivalent circuit accompanying drawing 3 mode (c))
Switching tube
,
Closure,
,
Disconnect diode
,
Work,
,
Do not work.Input power
Rise electric capacity by pump
, diode
Branch road powers to the load, and pump rises electric capacity
Continue charging.Pump rises electric capacity
Pass through diode
To load continuous discharge, inductance
Electric current is linear to be increased.
Corresponding [the t of switch mode d(
2, 2T
S] constantly, its equivalent circuit accompanying drawing 3 mode (b), (d))
To sum up, with inductance
Discharge and recharge once as one-period T
S, mode a(or mode c) work time and cycle T
SRatio then be duty ratio
DSo in one-period, by inductance weber balance can obtain converter voltage transmission relation formula:
, can be calculated pump and rise electric capacity
,
The duty ratio of the voltage at two ends and converter work
DHave no relations, it is on average to being
, because pump rises electric capacity, the voltage stress of switching tube and diode is clamped at too
Can find out that converter has higher voltage transmission ratio for the moment in pattern, and the voltage stress of switching tube and diode is less.
When be input as voltage lower (
) time, the present invention works in pattern two, and it also has four kinds of mode, below in conjunction with accompanying drawing 4, the work of each switch mode is analyzed.
Corresponding [0, the t of switch mode a(
1] constantly, its equivalent circuit accompanying drawing 4 mode (a))
At this moment, switching tube
,
Closure,
,
Disconnect diode
,
,
,
Do not work.Input power
Directly power to the load, pump rises electric capacity
,
Do not work inductance
Electric current is linear to be increased.
Corresponding [the t of switch mode b(
1, T
S] constantly, its equivalent circuit accompanying drawing 4 mode (b), (d))
Switching tube
,
,
,
All closed, diode
,
,
,
All work.Pump rises electric capacity
,
Do not work inductance
Pass through diode bridge
To load discharge, its electric current linearity reduces.
Corresponding [the T of switch mode c(
S, t
2] constantly, its equivalent circuit accompanying drawing 4 mode (c))
Switching tube
,
Closure,
,
Disconnect diode
,
,
,
Do not work.Input power
Directly power to the load, pump rises electric capacity
,
Do not work inductance
Electric current is linear to be increased.
Corresponding [the t of switch mode d(
2, 2T
S] constantly, its equivalent circuit accompanying drawing 4 mode (b), (d))
To sum up, and 1 is similar, with inductance
Discharge and recharge once as one-period T
S, mode a(or mode c) work time and cycle T
SRatio then be duty ratio
DSo in one-period, by inductance weber balance can obtain converter voltage transmission relation formula:
, but because under this pattern, switching tube and diode all are two tandem workings, its voltage stress is structure and reduce half thus also.Can find out that converter is identical with common BUCK variator when pattern two, but the voltage stress of switching tube and diode is less.
Fig. 5,6 is respectively the main waveform schematic diagram under converter work and the two kinds of patterns.
Find out that by Fig. 5 pump rises electric capacity
,
The voltage at two ends intermeshes, and works as switching tube
,
,
,
During equal closure, it all remains unchanged.Fig. 6 finds out that pump rises electric capacity
,
Do not work, its value is zero.
The present invention utilizes the switch bridge
And diode bridge
Double-bridge structure, adopt double working modes compatible better reduce switching device (switching tube and diode) voltage stress and increase the advantage of voltage transmission ratio; And under two kinds of mode of operations, the voltage stress of switching tube and diode is all less; Set switching value according to the ripple minimum principle simultaneously, make the present invention also have the autonomous function of switching of pattern.To sum up, the present invention can be applicable to the wider occasion of input voltage rate range better.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For those skilled in the art in the invention, can also make again suitable deduction, equivalents, improvement etc., but construct under the prerequisite of thinking not breaking away from the present invention, all should be included in protection scope of the present invention.
Claims (2)
1. the double mode wide input buck converter of bridge-type is characterized in that, comprises: the switch bridge
, diode bridge
, two pumps rise electric capacity
,
, filter inductance
And filter capacitor
Wherein, described switch bridge
By 4 N channel enhancement switch mosfets
,
,
With
Form first switch
With the 3rd switch
Series arm and second switch
, the 4th switch
Series arm in parallel; First switch
Source electrode and the 3rd switch
Drain electrode link to each other, its series connection node is designated as b; Second switch
Source electrode and the 4th switch
Drain electrode links to each other, and its node is designated as d; Two series arm parallel connections, first switch
Drain electrode and second switch
Drain electrode link to each other the 3rd switch
Source electrode and the 4th switch
Source electrode link to each other, node is designated as respectively a, g; The grid of 4 MOSFET pipes connects signal successively
,
,
With
Diode bridge
By 4 diodes
,
,
With
Form first diode
With the 3rd diode
Series arm and second diode
With the 4th diode
Series arm in parallel; First diode
Negative electrode and the 3rd diode
Anode link to each other, its series connection node is designated as c; Second diode
Negative electrode and the 4th diode
Anode link to each other, its series connection node is designated as e; First diode
Anode and the 3rd diode
The anode connected node be designated as f; The 3rd diode
Negative electrode and the 4th diode
Negative electrode link to each other and and switch bridge
Share a node a; Node a and node f are exactly diode bridge
Two sys nodes;
Two pumps are given birth to electric capacity
,
Respectively the switch bridge
And diode bridge
In separately brachium pontis couple together: first pump rises electric capacity
Anode be connected in node b, negative terminal is connected in node c, second pump rises electric capacity
Anode be connected in node d, negative terminal is connected in node e;
Filter inductance
And filter capacitor
Form a low pass filter, wherein, filter capacitor
Two ends shunt load equivalent resistance
By
,
,
The two-port network that forms meets respectively node a and node f;
2. the double mode wide input buck converter of described bridge-type according to claim 1 is characterized in that, at first, converter should be in advance according to the input supply voltage fluctuation range (
) and voltage switching point of ripple minimum principle calculating setting
, namely
When input voltage at switching point
When changing up and down, the converter mode of operation that can automatically switch; Secondly, converter has two kinds of mode of operations, when
The time, namely be called the high input voltage situation, converter work this moment and pattern one, its voltage transmission ratio is
D/ 2; When
The time, namely be called the low pressure input condition, converter work this moment and pattern two, its voltage transmission ratio is
D DSpan be [0,1].
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CN201210471440.6A CN102916582B (en) | 2012-11-20 | 2012-11-20 | Bridge-type dual-mode wide-input buck converter |
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CN102916582A true CN102916582A (en) | 2013-02-06 |
CN102916582B CN102916582B (en) | 2014-08-27 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109239673A (en) * | 2018-09-29 | 2019-01-18 | 扬州海科电子科技有限公司 | A kind of width phase control multifunction chip of 6-18GHz |
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---|---|---|---|---|
US20040114408A1 (en) * | 2000-09-05 | 2004-06-17 | Christophe Gaudin | Method and device for controlling power supply |
US20060087295A1 (en) * | 2004-10-26 | 2006-04-27 | Delta Electronics, Inc. | Non-isolated power conversion system having multiple switching power converters |
CN101404447A (en) * | 2008-03-12 | 2009-04-08 | 北方工业大学 | Soft switch BUCK converter and its design method |
CN101867314A (en) * | 2010-06-11 | 2010-10-20 | 李义 | Transform circuit adopting symmetrical cross-linked structure |
-
2012
- 2012-11-20 CN CN201210471440.6A patent/CN102916582B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20040114408A1 (en) * | 2000-09-05 | 2004-06-17 | Christophe Gaudin | Method and device for controlling power supply |
US20060087295A1 (en) * | 2004-10-26 | 2006-04-27 | Delta Electronics, Inc. | Non-isolated power conversion system having multiple switching power converters |
CN101404447A (en) * | 2008-03-12 | 2009-04-08 | 北方工业大学 | Soft switch BUCK converter and its design method |
CN101867314A (en) * | 2010-06-11 | 2010-10-20 | 李义 | Transform circuit adopting symmetrical cross-linked structure |
Non-Patent Citations (1)
Title |
---|
陆治国等: "基于降压型LED驱动电路分析和研究", 《深圳信息职业技术学院学报》 * |
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CN109239673A (en) * | 2018-09-29 | 2019-01-18 | 扬州海科电子科技有限公司 | A kind of width phase control multifunction chip of 6-18GHz |
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